The Rab Nimbus Jacket is a lightweight synthetic filled jacket that combinesprovides down style lofting with the wet weather insulating performance of a synthetic. This makes it perfect for keeping you warm in the UK's often cold and damp conditions.
The Pertex Quantum outer is lightweight, breathable, windproof and quick drying, it is DWR treated so it will easily shed snow and moisture. Cirrus insulation attempts to emulate down, but without the drawbacks when it gets wet or when it needs to be cleaned. Cirrus insulation is a synthetic insulation that unlike others has not been formed into a sheet. Instead it remains a loose water resistant down like fibre that expands to form a "cloud of warmth". It will deliver the same warmth for its weight as 600 Fill Power duck down. It's also very fast drying allowing Cirrus to get back up to its full insulation potential a lot faster than Hydrophobic down.
The hood is stretchy enough to be used under or over a helmet and it features a peak for assisting with protecting your vision in poor weather. The durable YKK Vislon front zip is backed with an insulated baffle for retaining your warmth and preventing any heat loss. The jacket can be stowed inside the left hand pocket as this doubles up as an integrated stuff sack. The hem drawcord and lycra cuffs help to seal the jacket and prevent unwanted spindrift gaining access.
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I bought this jacket for mountaineering - as a mid-layer underneath a hard-shell - and as a warm outer layer while belaying at the crag. I can't praise this jacket enough: it's super light and warm enough for a mild winter. Where I live it usually doesn't go below 5C and there were winter nights that I would feel comfortable with nothing but a long-sleeve shirt underneath the jacket.
I haven't tried it on in the mountain or in near-zero temperatures, but I'm fairly confident that it will do the trick, with maybe a t-shirt and a fleece underneath. The fabric seems to be super-sturdy notwithstanding the lightweight. I also admit that I picked it out for its design: it looks casual enough to be an around-town jacket and I've used it more than once outside at the crag.
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